Abstract: The inventive system, of the conduction type, comprises: a pair of power supply tracks, comprising a so-called live conductive track (11), designed to be electrically connected to a voltage source, and a so-called neutral conductive track (12), for the current return, designed to be electrically connected to a reference potential (Vref), the neutral track traveling parallel to the live track on a first side thereof; and a protective conductive track (13), designed to be connected to a ground potential, the protective track traveling parallel to the live track (11) on a second side thereof, opposite the first side. The system is installed in a roadway such that the live, neutral and protective conductive tracks are flush with a surface (18) of the roadway (2).

Abstract: A ground power supply line for electric traction vehicles is provided with two conductors carried by a series of tiles aligned to one another; each tile has a conductive plate and a lower supporting structure, which is made of insulating material and accommodates electric connectors, normally open switches, and a control and command unit, which switches the switches for selectively electrically connecting the conductive plate to the conductors in response to a signal deriving from an electric traction vehicle passing over said external conductive plate; the upper surface of the conductive plates is flushed with the remaining part of a road surface.